Introduction of the new vehicle emissions and fuel consumption test protocol, the Worldwide harmonised Light vehicles Test Procedure (WLTP) is already having an impact on what wheels and tyres are available in the market. Of course, the size of vehicle wheels and consequently tyres is hugely influential in vehicle carbon dioxide (CO2) and fuel consumption (miles per gallon – MPG) performance and in recent years there has been a trend by motor manufacturers to fit larger wheels to vehicles, including even larger rim sizes as options.